September is one of the warmer months of the year in Chestermere, with average highs near 18.6°C and lows around 5.5°C (mean 12.1°C). It is about average for rainfall, averaging 45 mm of rainfall and 64% relative humidity across the period.
September is one of the warmer months of the year in Chestermere. Across 45 years of records, the warmest September in Chestermere was 2025 — when the month averaged 16.4°C — while the coldest was 1985 at 6.8°C. Typical September days reach 18.6°C with nights near 5.5°C. The long-term trend is warming, about 0.7°C per decade.
September is about average for rainfall in Chestermere, averaging 45 mm of rainfall. The wettest September on record was 1986 with 115 mm, while the driest was 2025 at 9 mm.
Relative humidity in Chestermere during September averages 64%. The most humid September was 1986 at 76%, and the least humid was 2009 at 51%.
September receives about 3.8 kWh/m²/day of solar energy in Chestermere. The sunniest September was 1990 at 4.5 kWh/m²/day, and the cloudiest were 1986 and 2018 at 2.9.
Average wind speed in Chestermere during September is 2 m/s. The windiest September was 1985 at 2.5 m/s, while the calmest were 2008 and 2025 at 1.7 m/s.
Ranked against the other 11 months using 1981–2025 averages.
| Metric | 1980s | 1990s | 2000s | 2010s | 2020s | Change |
|---|---|---|---|---|---|---|
| Avg Temp | 10.3°C | 12.4°C | 11.9°C | 11.9°C | 14.6°C | +4.3°C |
| Avg High | 16.6°C | 19.5°C | 18.5°C | 18.2°C | 21.1°C | +4.5°C |
| Avg Low | 4.0°C | 5.4°C | 5.2°C | 5.5°C | 8.0°C | +4°C |
| Avg Rain | 65 mm | 31 mm | 50 mm | 46 mm | 28 mm | -38 mm |
September temperatures in Chestermere have risen by about 5.5°C between 1981–1985 and 2021–2025.
September has ranged from a record low of -7.8°C (2019) to a record high of 32.5°C (1998).
Rainfall in September is about average for rainfall, averaging 45 mm, with a wettest year of 115 mm.
Daytime highs and overnight lows have shifted differently — highs rose about 0.6°C per decade while lows rose 0.8°C per decade, narrowing the gap between day and night.
One of the best times to visit Chestermere
September is one of the best times to visit Chestermere. Expect days averaging 18.6°C and nights around 5.5°C (mean 12.1°C) — warmer than Chestermere's yearly average — with moderate rainfall (45 mm), so conditions are generally comfortable for sightseeing and outdoor plans.
| Year | Avg High | Avg Temp | Avg Low | Hottest Day | Coldest Day | Rainfall | Humidity | Wind | Solar |
|---|---|---|---|---|---|---|---|---|---|
| 2025 🔥 | 22.8°C | 16.4°C | 9.9°C | 28.7°C | 5.1°C | 9 mm | 66% | 1.7 m/s | 4.2 |
| 2024 | 21.0°C | 14.8°C | 8.5°C | 30.7°C | 1.5°C | 70 mm | 67% | 2 m/s | 3.9 |
| 2023 | 20.0°C | 13.8°C | 7.5°C | 28.6°C | 3.0°C | 27 mm | 63% | 1.9 m/s | 3.8 |
| 2022 | 22.3°C | 15.5°C | 8.7°C | 31.5°C | 1.8°C | 15 mm | 59% | 2 m/s | 4.1 |
| 2021 | 20.7°C | 13.9°C | 7.0°C | 26.9°C | 2.3°C | 16 mm | 58% | 2 m/s | 3.9 |
| 2020 | 19.9°C | 13.3°C | 6.7°C | 28.3°C | 0.6°C | 28 mm | 67% | 2.2 m/s | 3.7 |
| 2019 | 16.6°C | 11.3°C | 6.0°C | 25.4°C | -7.8°C | 70 mm | 72% | 2.1 m/s | 3.4 |
| 2018 | 13.5°C | 8.0°C | 2.5°C | 27.6°C | -5.3°C | 44 mm | 71% | 1.9 m/s | 2.9 |
| 2017 | 19.3°C | 12.6°C | 5.9°C | 31.3°C | -0.3°C | 26 mm | 61% | 1.9 m/s | 3.8 |
| 2016 | 17.7°C | 11.5°C | 5.4°C | 25.1°C | 1.4°C | 37 mm | 67% | 2 m/s | 3.8 |
| 2015 | 17.3°C | 11.0°C | 4.7°C | 27.9°C | 0.1°C | 65 mm | 68% | 1.9 m/s | 3.6 |
| 2014 | 17.8°C | 11.6°C | 5.4°C | 27.3°C | -7.6°C | 63 mm | 70% | 2 m/s | 3.6 |
| 2013 | 20.4°C | 14.1°C | 7.7°C | 29.2°C | -0.2°C | 52 mm | 63% | 2.1 m/s | 4.1 |
| 2012 | 22.1°C | 14.7°C | 7.2°C | 26.7°C | 1.8°C | 13 mm | 55% | 2.2 m/s | 4.3 |
| 2011 | 21.7°C | 14.3°C | 6.8°C | 28.2°C | 0.7°C | 20 mm | 59% | 2.2 m/s | 4.4 |
| 2010 | 15.3°C | 9.5°C | 3.7°C | 25.5°C | -3.0°C | 67 mm | 73% | 1.9 m/s | 3.1 |
| 2009 | 23.5°C | 15.5°C | 7.5°C | 31.6°C | 0.9°C | 9 mm | 51% | 2.4 m/s | 4.4 |
| 2008 | 18.2°C | 11.4°C | 4.7°C | 26.3°C | 1.4°C | 56 mm | 68% | 1.7 m/s | 4 |
| 2007 | 16.9°C | 10.6°C | 4.3°C | 25.8°C | -1.8°C | 47 mm | 67% | 1.9 m/s | 3.9 |
| 2006 | 19.4°C | 12.8°C | 6.2°C | 29.1°C | -2.3°C | 63 mm | 65% | 2.2 m/s | 3.7 |
| 2005 | 16.2°C | 10.2°C | 4.2°C | 24.8°C | -1.2°C | 81 mm | 72% | 1.9 m/s | 3.6 |
| 2004 | 16.4°C | 10.4°C | 4.5°C | 22.9°C | -3.5°C | 46 mm | 73% | 2 m/s | 3.4 |
| 2003 | 18.3°C | 11.7°C | 5.2°C | 31.2°C | -3.4°C | 53 mm | 62% | 2 m/s | 3.7 |
| 2002 | 16.7°C | 10.7°C | 4.8°C | 27.1°C | -0.6°C | 85 mm | 68% | 2 m/s | 3.4 |
| 2001 | 21.7°C | 14.2°C | 6.6°C | 30.0°C | 3.0°C | 17 mm | 52% | 2 m/s | 3.9 |
| 2000 | 17.9°C | 11.2°C | 4.4°C | 27.1°C | -6.0°C | 47 mm | 63% | 2 m/s | 3.7 |
| 1999 | 18.0°C | 11.2°C | 4.4°C | 27.3°C | -3.3°C | 14 mm | 59% | 2 m/s | 4.3 |
| 1998 | 21.5°C | 14.2°C | 6.9°C | 32.5°C | 0.3°C | 42 mm | 58% | 2 m/s | 4 |
| 1997 | 21.1°C | 13.9°C | 6.8°C | 29.0°C | -1.2°C | 33 mm | 60% | 2.1 m/s | 4.2 |
| 1996 | 15.6°C | 9.8°C | 4.1°C | 27.7°C | -1.9°C | 57 mm | 67% | 2.2 m/s | 3.1 |
| 1995 | 19.9°C | 12.9°C | 5.9°C | 28.9°C | -3.6°C | 25 mm | 58% | 1.9 m/s | 4.2 |
| 1994 | 22.3°C | 14.6°C | 6.9°C | 28.6°C | 1.1°C | 14 mm | 55% | 2 m/s | 4.1 |
| 1993 | 16.8°C | 10.3°C | 3.7°C | 26.2°C | -1.5°C | 35 mm | 67% | 2.1 m/s | 3.9 |
| 1992 | 16.6°C | 9.6°C | 2.6°C | 27.0°C | -4.1°C | 46 mm | 64% | 2.2 m/s | 3.5 |
| 1991 | 19.7°C | 12.5°C | 5.3°C | 26.8°C | -0.9°C | 31 mm | 61% | 2.1 m/s | 4.1 |
| 1990 | 23.3°C | 15.2°C | 7.0°C | 30.2°C | 0.9°C | 10 mm | 53% | 2 m/s | 4.5 |
| 1989 | 18.9°C | 12.0°C | 5.1°C | 26.3°C | -1.0°C | 42 mm | 65% | 2.1 m/s | 4.3 |
| 1988 | 18.7°C | 11.9°C | 5.1°C | 32.0°C | -3.2°C | 47 mm | 62% | 2.3 m/s | 3.3 |
| 1987 | 21.5°C | 14.1°C | 6.7°C | 29.8°C | 2.2°C | 31 mm | 58% | 2 m/s | 4.2 |
| 1986 🌧️ | 12.6°C | 7.5°C | 2.3°C | 23.0°C | -1.9°C | 115 mm | 76% | 1.9 m/s | 2.9 |
| 1985 ❄️ | 12.6°C | 6.8°C | 0.9°C | 21.2°C | -5.9°C | 113 mm | 71% | 2.5 m/s | 3.2 |
| 1984 | 13.7°C | 7.9°C | 2.0°C | 26.8°C | -6.1°C | 99 mm | 69% | 2.2 m/s | 3.4 |
| 1983 | 15.7°C | 9.4°C | 3.2°C | 27.6°C | -4.0°C | 19 mm | 63% | 2.3 m/s | — |
| 1982 | 16.7°C | 10.7°C | 4.7°C | 26.8°C | -3.5°C | 85 mm | 70% | 2.2 m/s | — |
| 1981 | 18.8°C | 12.3°C | 5.8°C | 30.4°C | -2.1°C | 37 mm | 63% | 1.9 m/s | — |
Actual recorded September data for each year, 1981–2025 — sourced from NASA POWER.
The average high in September is around 18.6°C with lows near 5.5°C (mean 12.1°C), based on 45 years of NASA POWER data.
September averages 45 mm of rainfall in Chestermere, about average for rainfall. The wettest on record was 115 mm in 1986.
The hottest September reached 32.5°C in 1998. The coldest dipped to -7.8°C in 2019.
Comparing the earliest years on record (1981–1985) with the most recent (2021–2025), average September temperatures have risen by about 5.5°C. Daytime highs moved from 15.5°C to 21.4°C and overnight lows from 3.3°C to 8.3°C over the same span.
September is one of the warmer months of the year in Chestermere and about average for rainfall, so plan for around 18.6°C daytime highs and 5.5°C at night.
Not quite — September is the 9th coolest month in Chestermere, averaging 12.1°C.
For September in Chestermere, pack warm layers and a jacket for chilly mornings, with typical highs of 18.6°C and lows of 5.5°C.
Relative humidity in September averages 64% — moderately humid.
Average wind speed in September is 2 m/s. The windiest September on record averaged 2.5 m/s (1985).
The wettest September on record was 1986 with 115 mm. On average, September sees 45 mm.
All figures are derived from NASA POWER (Prediction Of Worldwide Energy Resources), based on MERRA-2 satellite reanalysis, covering 1981–2025.
Explore how the weather in Chestermere behaves each September, based on 45 years of NASA POWER climate data from 1981 to 2025. This page breaks down average temperatures, rainfall, humidity, wind and solar radiation for September specifically, along with year-by-year records and how the month has changed over the decades.
